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Impact of Pollution on the Quality of Water in Three Freshwater Lakes of Suburban Chennai

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Impact of Pollution on the Quality of Water in Three Freshwater Lakes of Suburban Chennai Nature Environment and Pollution Technology Vol. 7 No. 1 pp. 61-64 2008 © Technoscience Publications IMPACT OF POLLUTION ON THE QUALITY OF WATER IN THREE FRESHWATER LAKES OF SUBURBAN CHENNAI R. Raveen, C. Chennakrishnan and A. Stephen* Department of Zoology, Madras Christian College, Chennai-600 059, Tamil Nadu, India *Department of Botany, Madras Christian College, Chennai-600 059, Tamil Nadu, India ABSTRACT The metropolitan cities of India are reeling under the pressure of severe water scarcity. Chennai is among the worst affected as it has suffered long spells of water shortages combined with rapid and haphazard urbanization of its ever-expanding suburbs. In light of the above, the water bodies that supply precious water to the human population and to the flora and fauna gain paramount importance. The present study was undertaken to asses the quality of water in three important lakes of southern suburban Chennai which recharge the ground water as well as harbours a diversity of plant and animal life. All the three lakes suffer from encroachments, dumping and burning of wastes, and unchecked inflow of domestic and industrial effluents. The parameters studied were: colour, odour, temperature, pH, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, alkalinity, total hardness, total solids, total dissolved solids, total suspended solids, sulphate and chloride. INTRODUCTION Rapid development, increase in population of the metro cities and urbanization of their suburbs have resulted in the manifold increase in environmental pollution. The most affected are the water bodies which become highly polluted by addition of foreign materials such as plant and animal matter, and domestic sewage and industrial effluents. Dumping of solid wastes and indiscriminate encroachments also add to the chaos. The diminishing quality of water seriously delimits its use for human consumption and for aquatic life. Therefore, the continuous and periodical monitoring of water quality is necessary so that appropriate preventive and remedial measures can be undertaken. The present study was done to evaluate various physico-chemical parameters of the three important freshwater lakes from the southern regions of Chennai metro. These water bodies recharge the groundwater and also harbour numerous aquatic lives. The physico-chemical characteristics of an aquatic body not only reflect the type and diversity of aquatic biota but also the water quality and pollution (Mir et al. 2004). MATERIALS AND METHODS Sampling sites: Three freshwater bodies viz., Chitlapakkam lake, Selaiyur lake and Sembakkam lake were selected for the study. These lakes are strategically located in the rapidly expanding southern region of Chennai city and catering to a large population. The water bodies were labelled Site 1, Site 2 and Site 3 respectively. Collection of samples: The water samples were collected for a period of 12 months, starting from January 2006 to December 2006. 125 mL glass bottles were used to collect and fix samples for estimation of dissolved oxygen (DO) content. Samples were collected in triplicate from each site during the four quarters of the year using PET bottles as per standard procedures. 62 R. Raveen et al. Analysis: The samples were analysed for a number of physico-chemical parameters employing standard methods (APHA 1998). The parameters included colour, odour, temperature, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), alkalinity, total hardness, total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), sulphates, chlorides. RESULTS AND DISCUSSION Based on the cyclic phenomenon of the climate, four seasons are recognized at Chennai even though it falls in the tropical zone. The seasons are post-monsoon (January-March), summer (April- June), premonsoon (July-September) and monsoon (October-December). The data presented here are discussed on the basis of these seasons. The results of physico-chemical analysis of three freshwater bodies for different seasons are given in Tables 1, 2 and 3. The temperature of water varied between 23.4°C and 32.5°C at Site 1, between 22°C and 34°C at Site 2, and 24.3°C and 36.4°C at Site III. In all the three sites a high temperature was recorded during summer and lower temperature during post-monsoon, which is a normal feature of water bodies in this region. The average pH values were 7.03, 6.98 and 7.38 at Sites 1, 2 and 3. The lowest pH values were recorded during monsoon and postmonsoon seasons, which indicates the influence of run-off water entering into the water bodies. The pH was slightly alkaline during summer and premonsoon which may be due to dumping of wastes, garbage and sewage water. The desirable limit of pH recommended by BIS (1992) is 6.5-8.5. The dissolved oxygen (DO) values at Site 1 ranged from 4.3 to 8.1 mg/L with a mean of 6.75 mg/L, and the values at Site 2 from 5.9 to 8.6 mg/L (mean 7.03 mg/L). At Site 3 DO from 5.4 to 7.6 mg/L with a mean of 6.55 mg/L. Dissolved oxygen is an important factor, which influences the health of an aquatic ecosystem. Higher values of DO were recorded during postmonsoon period at all the sites. The higher values of DO may be due to the influence of run-off water from monsoon rain. Lower level of DO was recorded during premonsoon season at all the sites. Atmospheric aeration and photosynthetic production of O2 by phytoplankton may be low during premonsoon and higher during postmonsoon seasons. DO levels between 5.3 and 8.0 mg/L are satisfactory for survival and growth of aquatic organisms. The BOD values at Site 1 ranged from 43 to 96.5 mg/L with a mean of 73.5 mg/L, and at Site 2 from 51 to 75 mg/L (mean 61.75 mg/L). At Site 3 BOD ranged from 52.5 to 97.3 mg/L with a mean of 71.1 mg/L. BOD is the measure of quantity of oxygen required by bacteria and other microorgan- isms under aerobic condition in order to biochemically degrade and transform organic matter present in the water bodies. The highest BOD value was recorded during premonsoon season in all the three freshwater bodies. The COD at Site 1 varied between 45 and 62 mg/L with a mean value of 52.15 mg/ L. The values at Site 2 ranged between 39.6 and 78 mg/L (mean 53.83 mg/L), while at Site 3 between 37.2 and 60.5 mg/L with a mean of 49.53 mg/L. The high COD value indicates a heavy load of organic and inorganic pollution that require more oxygen to oxidize under increased thermal con- ditions (Koushik & Saksena 1999). The total alkalinity values at Site 1 ranged between 98.5 and 148.6 mg/L with a mean of 123.28 mg/L. The values at Site 2 ranged between 107.5 and 143 mg/L (mean 128.88 mg/L), while the values at Site 3 between 87.4 and 121 mg/L with a mean of 105.15 mg/L. Excess alkalinity gives a bitter taste to water. Maximum alkalinity values were registered during summer at Site 1 and Site 3, whereas at Site 2, it was during premonsoon. The higher alkalinity in itself is not harmful to human beings, but still it delimits the water for domestic uses. The higher alkalinity values may be due to IMPACT OF POLLUTION ON THREE FRESHWATER LAKES OF CHENNAI 63 Table 1: Physico-chemical characteristics of Chitlapakkam lake (Site 1) from January to December 2006. S. NoParameter Jan-Mar ‘06 Apr-Jun‘06 Jul-Sep‘06 Oct-Dec‘06 Range 1. Colour (visual) Unclear Unclear Unclear Unclear - 2. Odour (sensory) Agreeable Agreeable Agreeable Agreeable - 3. Temperature (oC) 23.4 32.5 31.6 27.5 23.4-32.5 4. pH 7.2 7.6 6.9 6.4 6.4-7.6 5. DO (mg/L) 8.1 6.7. 4.3 7.9 4.3-8.1 6. BOD (mg/L) 66 88.4 96.5 43 43-96.5 7. COD (mg/L) 48.1 53.5 45 62 45-62 8. Alkalinity (mg/L) 98.5 148.6 127 119 98.5-148.6 9. Total Hardness (mg/L) 281 169 172 190 169-281 10. TS (mg/L) 762 558 690.7 556 556-762 11. TDS (mg/L) 656 460 596 445 445-656 12. TSS (mg/L) 106 98 94.7 111 94.7-111 13. Sulphate (mg/L) 296 317 305 245 245-317 14. Chloride (mg/L) 262 194 142 147 142-262 Table 2. Physico-chemical parameters of Selaiyur lake (Site 2) from January to December 2006. S. No Parameter Jan-Mar ‘06 Apr-Jun‘06 Jul-Sep‘06 Oct-Dec‘06 Range 1. Colour (visual) Unclear Unclear Unclear Unclear - 2. Odour (sensory) Agreeable Agreeable Agreeable Agreeable - 3. Temperature (oC) 22 29.4 34 33.5 22-34 4. pH 6.4 7.2 7.4 6.9 6.4-7.4 5. DO (mg/L) 8.6 7.2 5.9 6.4 5.9-8.6 6. BOD (mg/L) 54 67 75 51 51-75 7. COD (mg/L) 39.6 46.7 51 78 39.6-78 8. Alkalinity (mg/L) 107.5 138 143 127 107.5-143 9. Total Hardness (mg/L) 241 173 154 142 142-241 10. TS (mg/L) 640 598.4 542 671 542-671 11. TDS (mg/L) 543 510 630 537 510-630 12. TSS (mg/L) 97 88.4 112 134 97-134 13.
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